build: don't include deps/glib headers if glib enabled

If we're using the system glib library then we need to make sure not to
include headers under deps/glib otherwise we end up with with
incompatible typedefs that break the build.

Reviewed-by: Neil Roberts <neil@linux.intel.com>

(cherry picked from commit 5d5fc97b59951ec56a4193b7ee7909ebd3cfbb94)

cogl-gles2/Makefile.am

@@ -8,8 +8,11 @@ lib_LTLIBRARIES = libcogl-gles2.la
 
 INCLUDES = \
 	-I$(top_srcdir) \
-	-I$(top_builddir) \
-	-I$(top_builddir)/deps/glib
+	-I$(top_builddir)
+
+if !USE_GLIB
+INCLUDES += -I$(top_builddir)/deps/glib
+endif
 
 AM_CFLAGS = $(COGL_DEP_CFLAGS) $(COGL_EXTRA_CFLAGS) $(MAINTAINER_CFLAGS)
 

cogl/Makefile.am

@@ -18,7 +18,6 @@ lib_LTLIBRARIES =
 INCLUDES = \
 	-I$(top_srcdir)				\
 	-I$(top_builddir)			\
-	-I$(top_builddir)/deps/glib		\
 	-I$(srcdir)/tesselator			\
 	-I$(srcdir)/winsys 			\
 	-I$(srcdir)/driver/gl 			\
@@ -26,6 +25,10 @@ INCLUDES = \
 	-I$(srcdir)/driver/gl/gles 		\
 	$(NULL)
 
+if !USE_GLIB
+	INCLUDES += -I$(top_builddir)/deps/glib
+endif
+
 AM_CPPFLAGS = \
 	-DG_LOG_DOMAIN=\"Cogl\" 	\
 	-DCOGL_COMPILATION		\

examples/Makefile.am

@@ -1,8 +1,11 @@
 include $(top_srcdir)/build/autotools/Makefile.am.silent
 
 INCLUDES = \
-	-I$(top_srcdir) \
-	-I$(top_builddir)/deps/glib
+	-I$(top_srcdir)
+
+if !USE_GLIB
+INCLUDES += -I$(top_builddir)/deps/glib
+endif
 
 AM_CFLAGS = \
 	$(COGL_DEP_CFLAGS) \
@@ -17,9 +20,12 @@ endif
 
 common_ldadd = \
 	$(COGL_DEP_LIBS) \
-	$(top_builddir)/deps/glib/libglib.la \
 	$(top_builddir)/cogl/libcogl.la
 
+if !USE_GLIB
+common_ldadd += $(top_builddir)/deps/glib/libglib.la
+endif
+
 programs = cogl-info
 
 cogl_info_SOURCES = cogl-info.c

tests/conform/Makefile.am

@@ -110,8 +110,11 @@ BUILT_SOURCES = wrappers
 # testing (such as test-bitmask) will still compile
 INCLUDES = \
 	-I$(top_srcdir) \
-	-I$(top_builddir)/cogl \
-	-I$(top_builddir)/deps/glib
+	-I$(top_builddir)/cogl
+
+if !USE_GLIB
+INCLUDES += -I$(top_builddir)/deps/glib
+endif
 
 test_conformance_CPPFLAGS = \
 	-DCOGL_ENABLE_EXPERIMENTAL_API \